Hank talks about the last major way humans are impacting the environment in this penultimate episode of Crash Course Ecology. Pollution takes many forms - from the simplest piece of litter to the more complex endocrine distruptors - and ultimately, humans are responsible for it all.

In this investigation we grow some mustard seeds and see how they react by growing towards the light.
Teacher: Patrick Maye
Credits:
Kevin MacLeod: Who Likes to Party
Kevin MacLeod: Monkeys Spinning Monkeys
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